Apple Login With Supabase: A Swift Guide

by Faj Lennon 41 views

Hey guys! Today, we're diving deep into how to set up Apple Login with Supabase in your Swift apps. It might sound a bit intimidating at first, but trust me, we'll break it down into easy-to-follow steps. By the end of this guide, you'll be able to seamlessly integrate Apple's secure and user-friendly authentication into your Supabase-powered applications.

Why Apple Login with Supabase?

Before we jump into the how-to, let's quickly touch on why you might want to use Apple Login with Supabase in the first place. First off, convenience is key. Apple Login offers a frictionless experience for users already in the Apple ecosystem. With just a tap, users can sign up or log in using their existing Apple ID, eliminating the need to remember yet another username and password. This not only makes life easier for your users but also increases the likelihood of them actually creating an account and engaging with your app.

Secondly, security is paramount. Apple Login leverages Apple's robust security infrastructure, including Face ID and Touch ID, to protect user accounts. This significantly reduces the risk of password-related vulnerabilities and enhances the overall security posture of your application. Supabase, with its secure backend-as-a-service platform, complements Apple's security measures, providing a comprehensive security solution for your app. By integrating Apple Login, you're essentially offloading the responsibility of managing passwords and authentication to two trusted providers, allowing you to focus on building the core features of your application.

Finally, trust and privacy are crucial. Apple has built a strong reputation for prioritizing user privacy. When users sign in with Apple, they have the option to hide their real email address, which can help protect their privacy and reduce the risk of spam. This level of control over personal information can significantly enhance user trust in your application. Moreover, Apple Login provides a consistent and recognizable user experience across different apps and platforms, further reinforcing user trust and confidence. In today's digital landscape, where privacy concerns are paramount, offering Apple Login can be a significant competitive advantage for your app.

Prerequisites

Before we get our hands dirty with the code, make sure you have the following prerequisites in place:

  • An Apple Developer Account: You'll need this to configure Sign In with Apple capabilities.
  • A Supabase Account: Sign up at supabase.com if you haven't already. It's free to start!
  • Xcode: You'll need Xcode to build your iOS application.
  • A Swift Project: Create a new Swift project in Xcode, or use an existing one.

Step 1: Configure Sign In with Apple

First things first, let's configure Sign In with Apple in your Apple Developer account.

  1. Enable Sign In with Apple: Go to your Apple Developer account, navigate to Certificates, Identifiers & Profiles, and select Identifiers. Find your app's identifier and enable the Sign In with Apple capability.
  2. Create a Services ID: You'll also need to create a Services ID to represent your Supabase project. This allows Apple to securely communicate with your Supabase backend. When creating the Services ID, make sure to configure the Return URLs correctly. These URLs are where Apple will redirect users after they authenticate. You'll need to add your Supabase project's URL (e.g., https://your-project-id.supabase.co/auth/v1/callback) as a Return URL. Make sure to replace your-project-id with your actual Supabase project ID.
  3. Download your Team ID: Note down your Team ID, which you can find in your Apple Developer account. You'll need this later when configuring Supabase.

Step 2: Set Up Supabase Authentication

Now, let's head over to your Supabase project and configure the Apple authentication provider.

  1. Enable Apple Authentication: In your Supabase dashboard, go to Authentication > Providers and enable the Apple provider.
  2. Enter Configuration Details: You'll need to provide the following information:
    • Client ID: This is the Services ID you created in the previous step.
    • Team ID: This is your Apple Developer Team ID.
    • Key ID: Create a new private key in your Apple Developer account specifically for Sign In with Apple. Download the key and upload the .p8 file to Supabase. Also, note the Key ID associated with the key.

Make sure to save your changes. Supabase is now configured to handle Apple logins!

Step 3: Integrate Sign In with Apple in Your Swift App

Alright, let's get coding! We'll use the AuthenticationServices framework to implement Sign In with Apple in your Swift app.

  1. Import AuthenticationServices: In your ViewController.swift file (or wherever you want to implement the login), import the AuthenticationServices framework:
import AuthenticationServices
  1. Create an ASAuthorizationAppleIDButton: Add an ASAuthorizationAppleIDButton to your view. This button will trigger the Sign In with Apple flow. You can do this programmatically or using Interface Builder.
let appleButton = ASAuthorizationAppleIDButton()
appleButton.addTarget(self, action: #selector(handleAppleIdRequest), for: .touchUpInside)
view.addSubview(appleButton)
  1. Implement the Authorization Request: Implement the handleAppleIdRequest function to handle the authorization request. This function will create an ASAuthorizationAppleIDRequest and present the Sign In with Apple sheet to the user.
@objc func handleAppleIdRequest() {
    let appleIDProvider = ASAuthorizationAppleIDProvider()
    let request = appleIDProvider.createRequest()
    request.requestedScopes = [.fullName, .email] // Request full name and email

    let authorizationController = ASAuthorizationController(authorizationRequests: [request])
    authorizationController.delegate = self
    authorizationController.presentationContextProvider = self
    authorizationController.performRequests()
}
  1. Implement ASAuthorizationControllerDelegate: Implement the ASAuthorizationControllerDelegate protocol to handle the authorization results. This is where you'll receive the user's credentials and send them to Supabase.
extension ViewController: ASAuthorizationControllerDelegate {
    func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) {
        switch authorization.credential {
        case let appleIDCredential as ASAuthorizationAppleIDCredential:
            let userIdentifier = appleIDCredential.user
            let fullName = appleIDCredential.fullName
            let email = appleIDCredential.email
            let identityToken = appleIDCredential.identityToken
            let authorizationCode = appleIDCredential.authorizationCode

            // Convert identityToken and authorizationCode to Strings
            guard let identityTokenString = String(data: identityToken!, encoding: .utf8), let authorizationCodeString = String(data: authorizationCode!, encoding: .utf8) else {
                print("Failed to convert tokens to strings")
                return
            }

            print("User ID: \(userIdentifier)")
            print("Full Name: \(fullName?.givenName ?? "") \(fullName?.familyName ?? "")")
            print("Email: \(email ?? "")")
            print("Identity Token: \(identityTokenString)")
            print("Authorization Code: \(authorizationCodeString)")

            // Call Supabase signInWithApple
            signInWithApple(identityToken: identityTokenString, authorizationCode: authorizationCodeString)

        default:
            break
        }
    }

    func authorizationController(controller: ASAuthorizationController, didCompleteWithError error: Error) {
        // Handle error
        print("Authorization failed: \(error.localizedDescription)")
    }
}
  1. Implement ASAuthorizationControllerPresentationContextProviding: You also need to implement ASAuthorizationControllerPresentationContextProviding to tell the authorization controller where to present the Sign In with Apple sheet.
extension ViewController: ASAuthorizationControllerPresentationContextProviding {
    func presentationAnchor(for controller: ASAuthorizationController) -> ASPresentationAnchor {
        return self.view.window!
    }
}
  1. Call Supabase signInWithApple: Now, let's create a function to send the user's credentials to Supabase. You'll need to use the Supabase client library for Swift. First, install the Supabase client library using Swift Package Manager. Then, use the following code to sign in with Apple:
func signInWithApple(identityToken: String, authorizationCode: String) {
    Task {
        do {
            let session = try await supabase.auth.signInWithApple(identityToken: identityToken, authorizationCode: authorizationCode)
            print("Supabase sign in successful: \(session)")
            // Handle successful sign-in (e.g., navigate to the main screen)
        } catch {
            print("Supabase sign in failed: \(error)")
            // Handle sign-in error
        }
    }
}

Step 4: Handle the Sign-In Result

After the user successfully signs in with Apple, Supabase will return a session object containing the user's information and access token. You can use this information to personalize the user experience and secure access to your app's resources. For example, you can store the user's access token in secure storage and use it to authenticate subsequent requests to your Supabase backend. You can also display the user's name and profile picture in your app's UI.

Step 5: Testing and Debugging

Before you release your app to the world, it's essential to thoroughly test and debug the Apple Login integration. Make sure to test different scenarios, such as signing in with an existing Apple ID, creating a new Apple ID, and canceling the sign-in flow. Also, pay attention to error handling and provide informative error messages to the user in case something goes wrong. Use Xcode's debugging tools to inspect the network traffic and identify any issues with the communication between your app, Apple's servers, and Supabase.

Conclusion

And there you have it! You've successfully integrated Apple Login with Supabase in your Swift app. This not only enhances the user experience but also improves the security and privacy of your application. Remember to always prioritize user privacy and security when building your apps. By leveraging the power of Apple Login and Supabase, you can create a seamless and secure authentication experience for your users.

This guide provides a solid foundation for implementing Apple Login with Supabase in your Swift apps. As you continue to develop your application, you can explore additional features and customization options offered by both Apple Login and Supabase. Happy coding, and feel free to reach out if you have any questions! Remember to always consult the official documentation for the latest information and best practices.